sdad, I need you to work 1 hour a day with Dji on mid range pull up. Read and saw a lot of video of Lamont Butler working on this past off season. Dji's size and skill, this could be a huge part of his game. It is not the metrics some look for in today's game. But it has worked well for Lamont, and Kawhi Leonard, and Curtis Blair. When the a 6'5 guard with length and athleticism can make a 10-12 footer like a layup, it is a great weapon in the arsenal.
I know, these guys all have trainers and working out all off season, but I think a little extra dad time working on making 10-15 mid range in a row for an hour straight would do wonders
.
And then convince him to keep shooting them in games. Not disregarding the three's but he should be able to get 2-3 wide open 10 footers per game. Layups.